Mining column-bar.



No. 726.0 6. PATENTED APR. 21,1903. A. JOHNSON.

MINING COLUMN BAR.

APPLICATION FILED OUT. 22, 1902. no 1:20pm..

THE NQRRIS PETERS cm. movaumu, wnskmswou, u.c

UNITED STATES PATEN F OFFICE.

AUGUST JOHNSON, OF BUTTE, MONTANA.

MINING COLLlMN-BAR.

SPECIFICATION forming part of Letters Patent No. 726,066, dated April21, 1903.

Application filed October 22, 1902.; Serial No.- 128,240. (No model.)

To all whom, it may concern:

Be itknown that I, AUGUST JoH soN, a cili-' zen of the United States,residing at Butte, in the county of Silverbow and State of Montana, haveinvented certain new and useful Improvements in Mining Column-Bars, ofwhich the following is a specification;

My invention relates to improvements in mining column-bars-thatis tosay,a column bar or support used when mining with-a drill to facilitate theuse of a drill in mining.

The object of my invention is the provision of a column-bar which can bequickly adjusted for use and which will be strong and durable, simpleand inexpensive of construction, and thoroughly efficient andpracticalfor the intended purpose.

With this object in view my invention consists of an adjustablecolumn-bar embodying novel features of construction and combination ofparts snbstantiallyas disclosed herein.

Figure 1 represents a side elevation of a column-bar for miningconstructed inaccordance with and embodying my invention;

Fig. 2 represents a side elevation, partly in sections, to showinteriordetails. Fig. 3'rep resents a detail view of parts of mycolumnbar detached.

In the drawings, the letter A indicates the base or foundation of mycolumn-bar, which is a casting having the vertical tubular stem 13, theenlarged chamber 0, having the opening D on one side covered by a curvedmetal dust-cap E, and on the other side me casting is formed with thehorizontal bearing F, and on the inner side of its base portion isformed with aVeI-tical'disposed bearing G, and the outer face of thebase portionisformed with the ribs H, the purpose of which is to engagethe surface and hold the base portion from" turning. In the verticalbearing is mounted thelower end of the screw'J, which. is keyed at saidlower end, by means of the key -K,'to

the beveled gear-wheel L, which'beveled gearwheel meshes with thevertical driving beveled pinion M, mounted on the short horizon talshaft N, said shaft carrying at its outer end the disk 0, provided witha" series of openings P to receive the end of the handlever Q, thepurpose of which is to revolve the driving-pinion which revolves thebeveled gear, which, being connected to the screw, rotates the screw andadjusts the nut R, which is connected by means of the lug S, fitting inopening T of the column-bar U, and thus adjusts the column-bar up anddown or vertically to' suit the place where it is to be used. The columnbar is of the desired length and is preferably a hollow tube, and in theupper end of said column-bar is secured the cap V, provided with theribs W, which serve in connection with the ribs on the base of thecasting to secure the columnbar firmly in position by said ribs cuttinginto the surface where the operation of min-.

ing is being performed. From this construction it will be seen that mybar can be placed in position for use and adjusted instantly to suit thesize or space in which it is to be employed and that it will form anabsolutely perfect support for the wall and enable the drill to be usedwith ease. It will also be noticed that my column-bar iscomposed of fewparts, rendering the construction extremely simple and inexpensive, verystrong and 'durable, and entirely efficient in every respect. It willalso be understood that the working parts of my column-bar are protectedfrom dirt or dust and can be easily oiled, when desired, by removing thedust-caps, which is a feature of paramount importance in such a .device.

1. In a mining column-bar, the combination of the hollow base or supporthaving the opening on one side and the bearing on the other side, theprotecting-cover for the opening, the shaft mounted in the bearing, thebevel-pinion on the inner endof the shaft,

the disk on the outer end of the shaft having openingstomeceive a leverfor turning said disk, the vertical screw mounted in the hollow base,the bevel-gear therein meshing with' the bevel-pinion, and. thecolumn-bar connected, with said screw and adjusted thereby. U

I 2. In a miners column-bar, the combination of a hollow base havingsecuring exterior ribs, a horizontal shaft mounted in the base, means onthe outer end of the shaft for turning the said shaft, a verticaldisposed and a cap on the column having exterior scbevel-pinion on theinner end of the shaft, a horizontal bevel-gear meshing with said pin-In testimony whereof I affix my signature ion, a vertical screw mountedin the base in presence of two witnesses.

WVitnesses:

WM. MCGOWAN, JAMES NORTHEY.

having lugs and a column resting on the collar and having recesses toreceive the lugs,

l and connected to said gear-wheel, a collar AUGUST JOHNSON.

the screw engaging the collar and column, I

curing-ribs. 1o

